I92 UNIVERSITY OF COLORADO STUDIES 



A further table of male Ashmeadiella is given: 



Larger, 7 mm. long or a little over. denticulata Cresson 



Small, less than 6 mm. long. 1 



1 Tegulae reddish testaceous; length about 5 J mm. wings quite clear; abdominal 

 teeth red-tipped, middle ones much longer than broad (Rifle, Colo.). 



aridula Ckll. 

 Tegulae dark. 2 



2 Length nearly 6 mm., tegulae shining piceous; middle abdominal teeth much longer 

 than broad (Florissant, Colo., at flowers of Senecio cymbalarioides, June 29, Rohwer). 



cactorum Ckll. 

 Length about 4^ to 5 mm.; middle teeth of abdomen short. prosopidis Ckll. 



42 Marginal cell very long, almost reaching apex of wing; eyes hairy. Apis (26) 

 Marginal cell with tip distant from apex of wing. 43 



43 First recurrent nervure meeting first transverso-cubital; large bee with bright fulvous 

 hair on thorax and base of abdomen, and abdomen with white hair bands (New Mexico). 



Caupolicana yarrowi Cresson 

 First recurrent nervure not meeting first transverso-cubital. 44 



44 First discoidal cell much longer than marginal cell. 45 

 First discoidal cell not as long or scarcely longer than marginal cell. 



53 



45 Marginal cell short, not half the length of the first discoidal, and not or scarcely 

 extending beyond apex of third submarginal cell; parasitic bees. 46 



Marginal cell at least half the length of the first discoidal and extending more or less 

 beyond the third submarginal. 47 



46 Hair of thorax abundant and erect; first abdominal segment with hair like thorax; 

 rest of abdomen black, in one species with light spots. Bombomelecta (46) 

 Hair of thorax appressed; first abdominal segment black and bare at base; abdomen 

 with interrupted light bands. Pseudomelecta 



47 Third submarginal cell subquadrate, not or hardly narrower above than beneath; 

 marginal cell obtuse at tip; hairy bees; the clypeus partly or wholly yellow or white 

 in the male; tongue very long. 48 



Third submarginal cell narrower above than beneath, or when not so, insect without 

 erect hair; marginal cell extending far beyond apex of third submarginal cell. g j 



49 



48 Mandibles tridentate; apex of female abdomen with orange red hair; species nesting 

 in dead wood. Clisodon terminalis Cresson (27) 

 Mandibles simple or bidentate; species nesting in banks. Anthophora (47) 



49 Robust, pollen-collecting bees, the thorax with abundant erect hairs; similar to 

 Anthophora but first recurrent nervure reaching apical corner of second submarginal 

 cell. Emphoropsis (28) 

 Parasitic bees, less hairy, and with conspicuous pale markings, or when these are 

 absent, insect red. 50 



50 Abdomen black with conspicuous pale bands due to appressed scale-like hair. 



51 

 Abdomen with tegumentary bands (nearly always yellow) or spots, or red without 

 markings. 52 



